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In this paper, we propose a framework to jointly optimize user association and power control for the uplink cognitive small cell network (CSN). In the considered CSN, small cell base stations (SBSs) are deployed to serve a set of small cell user equipments (SUEs) by sharing the same licensed spectrum with a macrocell base station. The problem of joint user association and power allocation is formulated...
Machine-to-Machine (M2M) communication is used for automated data transmission and measurement between remote electronic devices. Every device that can use M2M communication will become a significant component of the Internet of Things (IoT) and Big Data. And there are many different applications of M2M communication (e.g., fleet management, smart metering, smart grid, and home/factory/city automation)...
3rd generation partnership project (3GPP) has considered Device-to-Device (D2D) group communications as a technique for public safety (PS) to support communications in emergency situations. For the PS service, we propose a novel scheme for cluster based D2D group communication. The proposed scheme enables the UEs to form clusters by using broadcast-based information exchange and to mediate the medium...
Many opportunistic scheduling techniques are impractical because they require accurate channel state information (CSI) at the transmitter. In this paper, we investigate the scheduling of unicast and multicast services in a downlink network with a very limited amount of feedback information. Specifically, unicast users send imperfect (or no) CSI and infrequent acknowledgements (ACKs) to a base station,...
Interference management is a key issue of heterogeneous network where operator-deploying macro base stations and user-deploying femto base stations coexist. Due to a large number of femtocells, centralized cell planning and interference management are impractical. In this paper, we propose a distributed frequency resource selection algorithm for self-organizing femtocell networks. The algorithm deals...
An inter-cell interference (ICI) problem between co-channel BSs has been one of main challenging research issues in downlink cellular networks. Fractional frequency reuse (FFR) and BS cooperation are useful techniques to manage the ICI problem. By combining the BS cooperation and FFR techniques, we propose to determine an efficient cooperation mode and the type of subchannels, i.e., reusable subchannels...
This paper studies energy-efficient resource allocation schemes in Wireless Sensor Network (WSN) where sensor nodes are densely deployed on the network with infrastructure support. We first construct a network scheme and compute the energy consumption with no intelligent resource management scheme for a given quality-of-service constraint defined as Signal-to-Interference-plus-Noise Ratio (SINR)....
This paper proposes an adaptive frequency assignment method and addresses the potential frequency sharing method. The paper investigates a scenario where a block of spectrum is shared between code division multiple access (CDMA) systems with different frequency bands, each with the same time-varying loads. Through simulation, we indicate that the adaptive frequency sharing method has a significant...
Cognitive radio (CR) technology has attracted dramatic attentions recently because it has an ability to dynamically adapt to local spectrum availability and improves the radio spectrum utilization. In this paper, we propose a channel allocation algorithm where the base station allocates a channel to the secondary user by using the primary user arrival pattern. The proposed scheme selects a channel...
In this paper, we present a method to optimally manage the access slots for the initial ranging contention process in IEEE802.16e air interface. In conventional method, the number of the initial access slot is fixed to a large number in common circumstance. The reason using the static large slot is to reduce the initial access collisions by slot contentions of the mobile terminals. Therefore the usage...
The multicarrier system has received great attention as a solution to transmitting high-rate data over wireless channels with severe inter-symbol interference, where the optimal power allocation scheme is known as the well-known waterfilling. In this paper, the so called block waterfilling (BW) is proposed, which is a hybrid of waterfilling and constant waterfilling. Within BW, there are three channel...
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